Sri Lanka decision proposal
Tell us what to change or add.
Archived decisions
Open a decision below. Check the area, period, inputs, result and proposed next step.
Use Change example to try different values. Use Data needed to check the fields and sources. The land-use change decision has its own comparison views.
Record your corrections below, then download your answers or print them.
Compare supplied sheet-and-rill loss estimates to plan detailed erosion assessments.
Verified published formula · USLE factor product
Fictional default example · 2025.
What the selected record shows. Estimated annual sheet/rill loss: 15.641 t/ha/year.
Next step. Check local factor and site evidence before selecting a detailed erosion assessment. Prepare assessment brief in the prototype creates a visible, downloadable draft. It is unassigned and not sent.
Local factor accuracy and site evidence are needed before choosing works.
R × K × LS × C × P, using a mutually consistent SI factor set.
This USLE factor product is not a full RUSLE2 run, measured loss, delivered sediment, gully loss or landslide forecast. Local factors and uncertainty need review.
Other required records: Land unit; erosivity; erodibility; slope factors; cover; support practices.
United States Department of Agriculture Forest Service · A Guide for Predicting Sheet and Rill Erosion on Forest LandGovernment publication · 1980 technical publication SA-TP 11; Universal Soil Loss Equation, printed page 2; metric conversion appendix, printed page 40
The historical source verifies the factor product. Local factor choice and suitability still need confirmation; this is not a full RUSLE2 implementation.
Calculation appendix
Compare contour strips, mulching and cover crops using site constraints and trade-offs.
Validation required
What the selected record shows. There is not enough information to choose this option. Obtain the records and evidence about conditions listed below. The supplied budget less cost is 300,000 LKR.
Next step. Obtain the missing records before choosing. Prepare evidence request in the prototype creates a visible, downloadable draft. It is unassigned and not sent.
Cost and descriptive benefits alone do not establish runoff reduction.
Compare each alternative's stated benefit, adverse effects, domain evidence and mandatory constraints. Where cost and budget are supplied, budget balance = budget − option cost. A budget balance alone does not determine domain feasibility or select an option.
Other required records: Treatment options; erosion-model inputs; implementation cost; maintenance; site constraints.
Check the area in each erosion class before planning survey coverage.
What the selected record shows. Class area: 120 ha.
Next step. Check category definitions, coverage and the stated denominator. Prepare composition report in the prototype creates a visible, downloadable draft. It is unassigned and not sent.
Unclassified land and class definitions must remain visible.
Category share = 100 × category amount / total compatible category amounts. HHI = sum of squared fractional shares, displayed on a 0–1 scale.
Categories must be mutually exclusive and cover the stated frame. Do not mix values, quantities, plots or hectares, or treat an HHI competition threshold as an institutional policy.
Other required records: Erosion class; mapped hectares; confidence; survey coverage; class definitions.
Compare soil-carbon records with matching depth, density and sampling conventions.
Verified published formula · Soil-carbon stock with volume correction
What the selected record shows. The supplied 1.8% carbon, 1.25 g/cm³ bulk density, 0.3 m depth and 12% coarse fragments give 59.4 t C/ha under the stated fine-earth convention.
Next step. Check sampling comparability before using the stock comparison. Prepare carbon comparison in the prototype creates a visible, downloadable draft. It is unassigned and not sent.
Stock differences do not establish a management effect without comparable samples.
(Organic carbon% /100) × bulk density × depth ×10000 × (1−coarse% /100). Confirm that the density and coarse-fragment conventions are mutually consistent.
A carbon concentration is not a stock. Change comparisons require consistent depth/mass, sampling, density convention and uncertainty review.
Other required records: Soil organic carbon fraction; bulk density; depth metres; coarse fragments; sample date.
Intergovernmental Panel on Climate Change · Good Practice Guidance for LULUCFInstitution publication · Section 4.3.3.5.4, equation 4.3.3, printed page 4.106, PDF page 18
The screen converts carbon percent to a fraction and uses the published coarse-fragment volume convention. Sampling and bulk-density conventions still need confirmation.
Compare the reported soil test with its stated parameter, method and example bounds.
What the selected record shows. The supplied Soil pH result is 6.2 pH. Its stated comparison range is 5.5 to 7.5 pH. Within example comparison bounds.
Next step. Obtain the missing evidence listed below. Prepare evidence request in the prototype creates a visible, downloadable draft. It is unassigned and not sent.
The page does not prescribe fertiliser or lime.
Compare the measured value only with matching parameter, unit, use and averaging period. Retain limit source/version and censored-result status.
Example bounds establish no compliance or diagnosis. Ambient, drinking-water, effluent, crop, food, air and noise standards are not interchangeable. A censored result is not an exact zero.
Other required records: Sample ID; crop; pH; nutrient results; lab method; reviewed crop limits.
Identify conductivity results that need a salinity investigation.
What the selected record shows. The supplied Soil electrical conductivity result is 2.8 dS/m. Its stated comparison range is 0 to 2 dS/m. Outside example comparison bounds.
Conductivity method, units, crop and soil conditions determine interpretation.
Example bounds establish no compliance or diagnosis. Ambient, drinking-water, effluent, crop, food, air and noise standards are not interchangeable. A censored result is not an exact zero. Physical concentrations and magnitude measurements are non-negative. Signed raw instrument signals need laboratory interpretation; do not silently replace them with zero.
Other required records: Electrical conductivity; sampling depth; irrigation-water quality; soil location; crop limits.
Identify bulk-density samples needing a compaction assessment.
What the selected record shows. The supplied Dry soil bulk density, stated core volume and sampling depth result is 1.65 g/cm³. Its stated comparison range is 0 to 1.5 g/cm³. Outside example comparison bounds.
No universal density threshold or management treatment is established.
Example bounds establish no compliance or diagnosis. Ambient, drinking-water, effluent, crop, food, air and noise standards are not interchangeable. A censored result is not an exact zero. Measured dry soil bulk density must be greater than zero; a missing result stays blank. The USDA definition is measurement context, not a universal compaction limit.
Other required records: Bulk density; penetration resistance; soil moisture; depth; crop root requirements.
Compare infiltration and runoff practices using measured outcomes and site constraints.
A proposed practice needs local evidence before its benefit is assumed.
Other required records: Infiltration tests; rainfall intensity; slope; treatment costs; runoff observations.
Check the site, runoff, storage, access and land evidence for water harvesting.
What the selected record shows. The required evidence is incomplete for this water harvesting case. The items below identify what must be obtained or reconciled.
A completed checklist does not select a construction site.
Check each required item and retain its reference. A documented item is not a scientific, legal or institutional approval.
Evidence completeness alone cannot establish suitability, eligibility, safety, permission or method validity.
Other required records: Catchment geometry; rainfall; storage sites; soil permeability; access; constraints.
Compare crop output per delivered water volume for matching seasons.
What the selected record shows. Saleable crop output: 19,780 kg; Matching irrigation water input: 7,200 m³. This gives 2.747 kg/m³.
Next step. Check matching outputs, denominators and operating conditions. Prepare performance comparison in the prototype creates a visible, downloadable draft. It is unassigned and not sent.
Low productivity alone does not identify which improvement will work.
Saleable crop output / Matching irrigation water input, for the same product, process and period.
Other required records: Accepted crop output kg; irrigation volume cubic metres; cultivated hectares; season.
Compare connected watershed interventions and their resource requirements.
A descriptive benefit does not establish a downstream causal effect.
Other required records: Catchment units; erosion risk; upstream treatments; downstream assets; costs.
Identify conservation works whose completion evidence is incomplete.
What the selected record shows. The required evidence is incomplete for this conservation inspection case. The items below identify what must be obtained or reconciled.
A missing inspection is not proof that work was not done.
Other required records: Work ID; approved design; inspection items; photographs; completion evidence.
Prepare rainfall observations and departures for an agricultural adviser.
What the selected record shows. Difference: -36 mm. Prepare the rainfall evidence for an agronomist; no crop advice is generated.
Next step. Prepare the rainfall evidence for an agronomist; no crop advice is generated. Prepare investigation brief in the prototype creates a visible, downloadable draft. It is unassigned and not sent.
A rainfall difference alone does not generate crop advice.
Later/comparison value minus Comparable reference value. Relative change = 100 × difference / Comparable reference value when the earlier value is positive.
Other required records: Station observations; crop stage; forecast issue time; forecast validity; location.
Identify stale or missing soil and weather observations.
What the selected record shows. Completeness: 80 %. Check overdue observation.
Next step. Check overdue observation. Prepare observation request in the prototype creates a visible, downloadable draft. It is unassigned and not sent.
Observation age and reporting completeness describe different gaps.
Completeness = 100 × valid / expected. Age = assessment date − latest valid observation; compare with the explicitly supplied interval.
A recent observation does not fill earlier gaps. Unknown schedule or observation time cannot establish freshness.
Other required records: Monitoring sites; expected observations; valid observations; outages; latest dates.
Check soil and climate evidence against a proposed crop's requirements.
What the selected record shows. The required evidence is incomplete for this crop suitability case. The items below identify what must be obtained or reconciled.
No crop-suitability score is invented.
Other required records: Soil depth; texture; slope; rainfall; temperature; crop requirements; irrigation.
Compare runoff changes in treated and comparison observations.
Verified published formula · Difference-in-differences arithmetic
What the selected record shows. Treatment change: 17; comparison change: 7; difference in changes: 10 mm/season. This comparison alone does not establish causation or benefit.
Difference in changes alone does not establish a conservation effect.
(Treatment after−before) − (comparison after−before), using the same outcome definition and periods.
The arithmetic alone does not establish causation. Design, parallel trends, confounding, attrition, uncertainty and adverse effects need appropriate evidence.
Other required records: Trial assignment; baseline runoff; follow-up runoff; comparison plots; rainfall.
World Bank · Impact Evaluation in Practice Second EditionInstitution publication · Chapter 7, table 7.2, printed page 140, PDF page 170
The formula is verified. Causal interpretation still requires a defensible study design, comparison and assumptions.
Compare costs per verified treated hectare using matching work scopes.
What the selected record shows. The supplied costs total 497,000 LKR for 5.4 ha. Cost per matching unit is 92,037.037 LKR/ha.
Next step. Review cost components and comparable verified outputs. Prepare cost comparison in the prototype creates a visible, downloadable draft. It is unassigned and not sent.
The least-cost figure alone does not establish value or treatment effectiveness.
Sum non-overlapping costs, then divide by the matching verified quantity for the same currency and accounting period.
An absent or zero denominator has no unit-cost result. Keep fixed, variable and opportunity costs identifiable.
Other required records: Treatment costs LKR; verified treated hectares; establishment date; maintenance cost.
Identify soil-test results needing further investigation.
What the selected record shows. The supplied Fictional soil lead (Pb) screen; stated digestion and assay method result is 12 mg/kg. Its stated comparison range is 0 to 10 mg/kg. Outside example comparison bounds.
An example comparison bound is not a site-safety or legal finding.
Other required records: Contaminant result; sampling location; lab method; applicable land-use limit; custody.
Identify farms with no confirmed conservation adoption and those with unknown follow-up.
What the selected record shows. 30 farms are known to be uncovered; 5 have unknown coverage. 65% are confirmed covered.
Next step. Check the records behind the uncovered and unknown groups. Prepare coverage follow-up in the prototype creates a visible, downloadable draft. It is unassigned and not sent.
Receiving guidance is not evidence that a practice was adopted.
100 × distinct covered eligible units / eligible frame. Known uncovered = frame − covered − unknown.
Count each eligible unit once for the selected service and period. Received messages, attendance, adoption and outcomes are separate measures.
Other required records: Eligible farms; extension visits; verified adoption; practice type; reporting period.
Check whether the same soil-loss method and inputs reproduce the stated result.
What the selected record shows. Difference: -10 t/ha/year. Investigate reproduction difference.
Next step. Investigate reproduction difference. Prepare reproduction-check note in the prototype creates a visible, downloadable draft. It is unassigned and not sent.
A difference requires investigation; it does not by itself identify the faulty source.
Reproduced minus expected result, within an explicitly supplied absolute tolerance, using the same exact input/method versions and a separate checker. Retain originals, code, parameters and environment evidence.
Other required records: Input hashes; factor sources; model version; parameters; independent result; tolerance.
Source. Sri Lanka publication.
Data needed. Paddy field, soil EC from a 1:5 soil-to-water test, unit (dS/m), date and sample reference.
Method. Apply the RRDI bands for soil EC measured using a 1:5 soil-to-water test. Below 0.15 dS/m, the guidance calls for no salinity package. From 0.15 to 0.40 dS/m, review a salt-tolerant rice variety. Above 0.40 dS/m, review the salinity package.
Worked example. A paddy-field result of 0.25 dS/m from a 1:5 soil-to-water test falls in RRDI’s salt-tolerant variety band. Check the field and available varieties with the local extension officer.
Next step. Check the site and applicable guidance with the local extension officer before choosing a field response.
Rice Research and Development Institute, Map based soil reclamation in rice cultivation. Soil EC level and recommended measures table.
Confirm the field and test method. The bands apply to paddy and the stated 1:5 soil test. Keep saturated-paste ECe results separate.
Check which existing source fields can supply the decision inputs.
Existing form reference: 678a3e2dcda3b2df
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Your institution has its own document and image library. Use the same library for reports, photos and other evidence.
Open this screen for Natural Resources Management CentreSee the presentation example
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Data structure keeps the existing source tree, records, charts and map. Manage structure adds a place to propose changes to definitions.
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We currently use public data and published reports where available. Please confirm whether your institution can provide data directly, so we can avoid retyping or reading figures from PDFs.
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